United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "July 1988," PPI Detailed Report (July 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21632/toc/109854 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "July 1988," PPI Detailed Report (July 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21632/toc/109854 , accessed on May 10, 2024.